Improvement in steam-engines



a. B. snzvzusou.-

Steam-Engine.

Patented Oct. 11,1875.

I S I I l I l l I I l l l I I l I i VIEW TOR Attorneys new, WASHPNGTQ'L0 cf UNITED STATES PATENT OFFICE.

GEORGE B. STEVENSON, OF UPPER SANDUSKY, OHIO.

IMPROVEMENT IN STEAM-ENGINES.

Specification forming part of Letters Patent No. 168,803, dated October11, 1875 application filed August 21, 1875.

To all whom it may concern:

Be it known that I, GEORGE B. STEVEN- soN, of Upper Sandusky, in thecounty of Wyandot and State of Ohio, have invented a new and valuableImprovement in Steam-Engines; and I dohereby declare that the follow--ing isa full, clear, and exact description of the construction andoperation of the same, reference being bad to the annexed drawingsmaking a part of this specification, and to the letters and figures ofreference marked thereon.

Figure I of the drawings is a representation of a longitudinal verticalsectionof my steamengine, and Fig.2 is a transverse vertical sectionalview of the same. Fig.3 is a transverse vertical sectional view of theslides and their attachments.

This inventionhas relation to the construction of steam-engines, wherebyI obtain light ness and strength, at the same time cheapness andsolidity and the novelty consists in the construction of the parts, aswill be hereinafter more fully set forth.

In the annexed drawings, A A designate the two legs which constitute myengine-bed, which legs are connected together by an arch, B. This bed ismade up of flanges and a web, preferably cast entire. Upon this bed isformed a horizontal cylinder,- G, terminating at one end in a head, D,having a flange, a, and a stuflingbox, b, which latterreceives throughit a piston-rod, E. This piston-rod has a piston, F, on one end, whichworks in a steam-cylinder, G, bolted by its flange c to the flange a ofthe cylinder 0, as shown in Fig. 1. By these means the head D of thecylinder 0 serves as the head for one of the ends of the steam-cylinderG; J is the cross-head on the piston-rod, constructed with cars 01 and awristpin, f, for the pitman-rod. This cross-head J is also constructedwith square sockets z in its upper and lower sides, which receive squareshanks e 6 formed on two slides, g g, the faces of which are convextransversely,as shown in Fig. 2, for the purpose of fitting the concavesurfaces of slideways h it formed on the inside of the cylinder 0. Theseways h h extend the full length of the traverse of the cross-head,

and in cross-section their surfaces are concentric to the axis of thepiston-rod and cylinder 0. This concentricity of the surfaces of theslideways and slides allows the cross-head to be adj ust-ed about itslongitudinal axis, so that proper connections of the pitman-rod with thecross-head and crank can be conveniently made and all binding of theparts prevented.

In order to compensate for the wear of the slides and slideways I makethe slides adj ustable by means of set-screws s s, which are ac:cessible by means of an opening through the cylinder 0. The open end ofthe cylinder (J terminates in a receiver for the brasses, which affordjournal-bearings for the driven shaft.

cylinder 0, having concave slideways h, substantially as and for thepurpose set forth.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

GEORGE B. STEVENSON. Witnesses:

R. L. STEVENSON, S. S. PETTIT.

